Revised
IEC 60068-2-21:1960/AMD1:1967 ED2
IEC 60068-2-21:1960 ED2
IEC 60068-2-21:1975 ED3
IEC 60068-2-21:1975/AMD1:1979 ED3
IEC 60068-2-21:1975/AMD2:1980 ED3
IEC 60068-2-21:1983 ED4
IEC 60068-2-21:1983/COR1:1991